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Free Content Optimization of sigma amplitude threshold in sleep spindle detection

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Sleep spindles are transient EEG waveforms of non-rapid eye movement sleep. There is considerable intersubject variability in spindle amplitudes. The problem in automatic spindle detection has been that, despite this fact, a fixed amplitude threshold has been used. Selection of the spindle detection threshold value is critical with respect to the sensitivity of spindle detection. In this study a method was developed to estimate the optimal recording-specific threshold value for each all-night recording without any visual scorings. The performance of the proposed method was validated using four test recordings each having a very different number of visually scored spindles. The optimal threshold values for the test recordings could be estimated well. The presented method seems very promising in providing information about sleep spindle amplitudes of individual all-night recordings.

Keywords: automatic detection; sleep EEG; sleep analysis; sleep spindles; threshold

Document Type: Research Article

Affiliations: 1: Signal Processing Laboratory, Tampere University of Technology, Finland 2: Department of Clinical Neurophysiology, Tampere University Hospital, Finland

Publication date: December 1, 2000


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